Protégé 4.1

Description Protégé is an environment for creating and editing ontologies and knowledge bases. In KBS (Knowledge Based Systems) we were supposed to use version: Protégé 4.1. After installing it I kept getting the same error message (also included picture in attachment): <code> C:\Program Files\Protege_4.1>java -Dlog4j.configuration=file:log4j.xml -DentityExpansionLimit=100000000 -Dfile.encoding=utf-8 -Dorg.protege.plugin.dir=plugins -classpath bin/felix.jar;bin/ProtegeLauncher.jar org.protege.osgi.framework.Launcher Core Bundle 1 failed to start. Exception in thread "main" org.osgi.framework.BundleException: Unresolved constraint in bundle org.protege.common [1]: package; (&(package=javax.swing.text)(version>=0.0.0)) at org.apache.felix.framework.Felix.resolveBundle(Felix.java:3295) at org.apache.felix.framework.Felix.startBundle(Felix.java:1653) at org.apache.felix.framework.BundleImpl.start(BundleImpl.java:905) at org.apache.felix.framework.BundleImpl.start(BundleImpl.java:892) at org.protege.osgi.framework.Launcher.startBundles(Launcher.java:111) at org.protege.osgi.framework.Launcher.start(Launcher.java:80) at org.protege.osgi.framework.Launcher.main(Launcher.java:143) </code> Why does this error occur? How can I make Protégé 4.1 run?